Okay a little bit of mystery, and going into the old discussion of archetypes, I sort of noticed this soon after Toxtricity was revealed two years ago, but these three seem to fit a common "archetype". Toxtricity seems to share a lot in common with Lucario and Zoroark, the two most marketed mons of Gens 4 and 5, respectively, minus the fact that it's not shoved in everyone's faces to the same extent that Lucario is and didn't get a movie before its generation like Lucario and Zoroark did: however, pictures in USUM depict what seems to be G-Max Toxtricity so it was likely in creation well before Gen 8 began.
But in-game mechanics wise, these three seem to share a large amount in common:
- Two-stage line (all three)
- First stage has a catch rate of 75, second stage has a catch rate of 45. This is unique to the three of them.
- Toxel is a baby Pokemon like Riolu. While Zorua isn't a baby Pokemon, it evolves at Level 30, which is also Toxel's evolution level
- All three are in the Medium-Slow exp group, which is rare for two-stage evolution lines (the vast majority are in the Medium-Fast EXP group)
All in all, these three seem to fit a distinct "archetype" in a sense. Only...the question is what exactly is supposed to stand out about Lucario, Zoroark, and Toxtricity? The other clear-cut archetypes are distinct in their function in the grand scheme of things:
- The early mammals evolve once around Level 20, and are weaker than everything else
- The early-route birds have one of two tendencies aside from being obtained early game: either they are three-stage and evolve around the same levels as a Starter, or some are two-stage and evolve once around Level 20 like the rodents
- The Pikaclones are single stage and Electric-type and cute. Really simple in that regard.
- The early-route bugs are obtained early and in many cases, evolve very early.
- The pseudo-legendary is obtained late usually, is in the Slow EXP group, and evolves late, later than any other Pokemon from that particular generation they debuted in, and has 600 BST in the final stage. Catch rate is consistent 45 across.
- The starters are obvious: three-stage Grass/Fire/Water, first mon you get in a game, consistent catch rate of 45, etc.
- Fossils are, usually, except with Galar, two-stage lines who can only be revived from a fossil. Like starters and pseudos, they always have a catch rate of 45.
When it comes to Lucario, Zoroark, and Toxtricity, there are clear commonalities between them that are distinct, but I'm not really sure how to label these three or what specifically denotes what makes the three of them similar to each other and stand out from the rest. It's interesting that these three are just that similar yet there's no clear way to identify them.